package com.xiaotu.facade;

/**
 * @author 张晓
 * @create 2020-06-23 14:53
 */
public class Stereo {
    public static Stereo instance = new Stereo();
    public static Stereo getInstance(){
        return instance;
    }

    public void on(){
        System.out.println(" stereo on ");
    }
    public void off(){
        System.out.println(" stereo off ");
    }
    public void up(){
        System.out.println(" screen up... ");
    }
}
